英语作文The advantages and disadvantages of space travel
问题描述：
英语作文The advantages and disadvantages of space travel
答
The Advantages and Disadvantages of Space Travel.It is now over 30 years since man fist walk on the moon.Man has not yet reached Mars,although unmanned spacecrafts have been sent there．The case for more research into space travel and more flights to othe planets is a complicated one.